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Issue 4, 2004
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Stable gold(iii) complexes with thiosemicarbazone derivatives

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Novel thiosemicarbazonato complexes of gold(III) have been prepared from reactions of [Au(damp-C1,N)Cl2 (damp- = 2-(N,N-dimethylaminomethyl)phenyl) or [NBu4][AuCl4] with 2-pyridineformamide thiosemicarbazones (HL). The thiosemicarbazones deprotonate and coordinate as mononegative, tridentate NNS ligands to gold to give [Au(Hdamp-C1)(L)]Cl2 or [AuCl(L)]Cl complexes. The organometallic damp ligand is protonated during the reactions and the Au–N bond is cleaved. The [AuCl(L)]+ cations represent the first gold(III) complexes with thiourea derivatives which are not stabilised by an additional organometallic ligand. Reactions of [NBu4][AuX4] (X = Cl, Br) with diphenylthiocarbazone (dithizone) result in reduction of the metal and the formation of gold(I) complexes of the composition [AuX(SCN4-3,4-Ph2)] where SCN4-3,4-Ph2 is 3,4-diphenyltetrazole thione which is formed from cyclisation of dithizone.

Graphical abstract: Stable gold(iii) complexes with thiosemicarbazone derivatives

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Article information

16 Oct 2003
05 Jan 2004
First published
19 Jan 2004

Dalton Trans., 2004, 677-682
Article type

Stable gold(III) complexes with thiosemicarbazone derivatives

I. Garcia Santos, A. Hagenbach and U. Abram, Dalton Trans., 2004, 677
DOI: 10.1039/B312978K

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